Plaster board



INVENTQR T. D. PRIDDY PLASTER BOARD Filed Feb.

sept. 22, 1931.

Y-IOMA D Pzempy EY K ATTORNEYS,

Patented Sept. 22, 1931 laire sra'res TENT ortica".

THOMAS n. riarnnv, or CLEVELAND, orare, assreivoa To Tira noemen ernst Paon-V uo'rs Coiirnnv, or CLEVELAND, oiaro Presman Boeri-,n

Application filed February. 13, 1929. Serial No; 333,683.

rihis invention relates to an improved form of plaster board.

lThe object of the present invention is to devise a form of plaster board Vwith an imnroved meansof joining' the plaster board sections their joints both along the ends and sides thereof, the idea being to devise a means whereby even ordinary plaster maybe used at such joints without danger of such plaster vl0 dislodging therefrom upon drying ot the same.

Other objects willappear from the following description and claims when considered together with the accompanying drawings.

F ig. l is a partial front elevation of my improved structure; Figs. 2, 3 and 4 are sectional views taken on lines 2 2, 8-3, and 4 4, respectively, of F ig. l.

According to the present invention, the sections ot plaster board are securedvto the metal studding l and the plaster board is of a form comprising al core 2 of plaster with the paper covering 8 extending over the two sides thereof. In the present case, the paper Covering may be terminated at the edges of the core, as indicated in the drawings. it is to'be understood that the sections of plaster board may be arranged in staggered relation with respect to their joints.

Heretotore, diliiculty has been experienced because of the drying of the plaster or other E ce binding material which is applied to the joints between the sections of plaster board,

with the result that such plaster at the joints would crumble and fall out of the joints, thereby causing a considerable weakness and a very decided objection to such form of structure. This drying of the plaster at the joints has been dueto the absorption of the moisture of such plaster by the core 2 of the plaster board. YvVith the present arrangement, this objectionable feature has been ref moved.

As indicated in the drawings, the sections oi plaster board are formed with spaced longitudinal dove-tail grooves 4 into whichl there is adapted to be applied the plaster which is generally used as a coating over. the entire structure of plaster board sections e aiterthey have been placed in position. This coating of plaster is indicated by reference numeral 5. These grooves 4 yare so constructed and arranged that they will be substantially equi-distant apart and there will occur such a groove at the joint between two adjacent sections of plaster board, as clearly illustrated in F ig. 2.v As will be apparent, the dove-tail form of groove tends to prevent `the falling of the plaster from the surface of thek plaster board and this advantage is especially important and valuable at the joints between the plaster board sections for reasons already referred to. That is, in spite oi the tendency of the core of the plaster board to absorb the moisture of the plaster at the joints meral 4t.

Another feature of the present invention consists in the beveling oi the ends of the plaster board sections, as indicated especially in Figs. 3 and 4. That is, upon assembling the sections ot plaster board, there will be provided a beveled groove between the adjacent ends ot the sections with the result that the surface area over the edges of the ends of the plaster board sections is substantially increased and the eiiiciency with which the plaster adheres to these edges, is increased to a corresponding degree. That is, the ends of the plaster board sections are beveled in a direction transversely orn the dove-tailv grooves 4 and there is thus provided what might be considered an effective means kof binding engagementv about the end edges of the plaster board sections both with respect to the plaster in thedove-tail grooves 4 and also that which is applied tothe main portion of the :othersurface of the plaster board sections. Those portions of the plaster board l is a distinct cooperation of the ends of the plaster boar ysections and the provision of dove-tail grooves which ex-,

fthermore, this cooperation is the ed ges of the pla of usine' a forni plaster or the sections which extend between the dove-tail grooves may be considered as ribs and although the layer of plaster over the surface between the beveling tend longitudinally ofthe sections. Furemphasized especia-ily he points do since both the beveling of the ends and the provision of the dove-tail grooves the l joints serve as elfe :iv-e means r lodginent the glasteL fro;A the joints. ln other Words, the c mbinedA eiiect which is produced by these We fea tw t invention is most ,proinine t Where 'the longitudini` meet. it is at this point trat i i need for such improvement as is provide by the present invention.

The present disclosure poses of illustration, tions might be from the spi of instance, the ang se is ons Wr i .ut the present i 'ention For le of the bevel on both the side and end edge portions of the f board maybe vr-riedV falso ie depth bevel groove on ne' end a groove along the side edges may various icv bo: e line and may be arranged the p i in various i anners at `er board.

VIN ,e J I f v Une oi the prim ai aova present invention mes in the .ern anency with sin] t-in binding` material will in vvell as over the entr wail construction. rhus, the a` not marred by crumbling and of the'plaster from the joints, of is likewise reduced to a niaiiinnn. Another advantage consists in the ypossibili in vvhicn the'covering 5 does not extend d of the board. Y That is, pracany rorin of board-can. be Y: cient manner with the present invention. rlhis also means a reduction in cost.

Y @ther advan will be apparent to-those Who are familiar ivithitheart to which the present invention relates.l Y

- 1. A Wall board construction comprising av plurality of sections arranged With their adrvide ised in an signature. A

jacent edges in close proximity to each other, some of said edges being beveled so as to pro'- vide a joint space of increasing Width from the bottom Vto the top of said joint, other of said edges being undercut from the surface of the section sov as to provide dove-tail form of joint space, and binding material applied to said joint spaces. 2. ln a construction of the class described, a section of plaster board or the like having one edge portion thereof continuously undercut with respect to and from the front surface'of the plaster board so as to form part of a dove-tail groove through part of the thickness of the board to supplement a simi- -larlyk formed edge portion-of a companion section when assembled together.

3. A Wall construction comprising a plurality of sections of plaster board arranged With their adjacent edges in close proximity to each other each section of the plaster board having a core of plaster and a covering therefor, said plaster board sections having the plaster cores thereof exposed at "said edge's, a plaster material applied to the joint space bets/'een the exposed plaster cores at said adja'c edges, so'as toadhere thereto, and means for maintaining the same in set position in said joint space.

fr Wall construction comprising a plurality of sections of 'plaster board arranged with their adjacent edges in close pr ximity to each other, said edges being beveled so to form a joint space of increasing vtidth from the bottom to the top of joint each section of the plaster board having a core of plaster and a covering therefor, said plaster board sections having the plaster cores thereof exposed at said edges, j

anda plaster materialV applied to the joint space between the exposed plaster cores at said adjacent edges so as to adhere thereto. 5. Wall board construction comprising a ality of sections arranged with their adcent edges in close proximity to each other, ome of said edges being beveled so as to proa joint space of `increasing Width from the bottom to the top of said joint, other of edges being undercut from the surface the section so as to provide dove-tail form of joint space, each of said sections having a core of plaster a covering therefor, said sections having the plaster cores thereof exosed at at least somel of the edges, and a laster material ap'alied to the oint space be- 'Ween Vthe exposed plaster cores at said ad .cent edges so as to adhere thereto.

In testimony whereof, l hereby aflix my Tnoinis n. Painnv.

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